Asp Viper

Maximum longevity: 25 years Observations: In one laboratory study these animals lived only a maximum of 10 years and reached maturity sooner (2 versus 4 years) than wild animals, suggesting that environmental conditions, which may induce hibernation, are factors in longevity (Castanet 1994). It stops growing by 7-8 years (Caleb Finch 1990).